15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Dynamics of field-driven colloids

18 Jun 2014, 15:00
15m
A-226 (Laurentian University / Université Laurentienne)

A-226

Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Non-Student) / orale (non-étudiant) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) (W2-4) Biophysics/Soft Condensed Matter IV: Microfluidics & Driven Motion - DCMMP-DMBP / Biophysique et matière condensée molle 4: microfluidique et mouvement mené- DPMCM-DPMnB

Speaker

Anand Yethiraj (Memorial University)

Description

External electric fields modify inter-particle colloidal interactions and the resulting ´´electrorheological´´ structures are well documented [1]. However, the dynamics of colloids in the presence of these external fields is less studied [2]. In this work, the dynamics of colloids is reported in three regimes. At high frequencies, inter-particle dipolar interactions dominate. At intermediate frequencies, polarization charge effects are dominant. Finally, at very low frequencies, the primary interactions are electrophoretic. Regimes of both normal and anomalous diffusion are observed. A direct correlation can be made between the dynamics and the nature of the structures formed. [1] R. Tao, J. M. Sun, Phys. Rev. Lett. 67, 398-401 (1991); J. E. Martin, J. Odinek, T. C. Halsey, Phys. Rev. Lett. 1524-1527 (1992); A. Yethiraj, A. van Blaaderen, Nature 421, 513-517 (2003); A.K. Agarwal, A. Yethiraj, Phys. Rev. Lett. 102, 198301 (2009). [2] J. Dobnikar, A. Snezhko, A. Yethiraj, Soft Matter, 9, 3693-3704 (2013).

Primary author

Anand Yethiraj (Memorial University)

Co-authors

Mr Edward Hayden (Memorial University of Newfoundland) Mr Tatsuo Izawa (Memorial University of Newfoundland)

Presentation Materials